Supported laminations for electric apparatus and method of making the same



'H.F.STRATTON.

- SUPPORTED LAMINATIONS FOR ELECTRIC APPARATUS AND METHOD OF MAKING THE SAME.

APPLICATION mm SEPT. 21. 1921.

1,432,637. I Patented 0ct..17,192 2.

./9 5 J 4 v 5 i A. I 7 1 II:

Patented Oct. 17, 1922 UNITED STATES PATENT OFFICE.

HARRY F. STRATTON, 0F CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRIC CONTROLLER & MANUFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO,

SUPPORTED LAMINATIONS FOR ELECTRIC APPARATUS AND METHOD OF MAKING THE SAME.

Application filed September 21, 1921.

To all whom it may concern.

Be it known that I, HARRY F. STRATTON, a citizen of the United States, residing at levcland, in the county oi Guyahoga and State of Ohio, have invented new and useful Improvements in Supported Laminations for Electric Apparatus and Methods of Making the Same, of which. the following is a specification.

My invention relates to methods of assenr bling laminated structures with their supports or frames, and also to the combination of such structures with their SllpPUllS and frames.

It is the principal object'ot this invention to provide a method whereby an assembly of laminations may have its Slllipfllt or frame cast in such a relatim'i thereto that upon the cooling of the casting, the latter will shrink so as to suitably clamp the laminations tightly together and also ti htly clamp the assembly in the casting. ather objects appear hereinafter.

In the specification and drawings, I have described and illustrated the invention as applied to an induction motor. but it is evident that it may be applied to dynamo-electric machines in general, to transformers, and to other types of electrical apparatus.

Referring to the accompanying drawings, l ig. l is an clemtion of the stator ol" an iniilin-tiou motor with the windings omitted; Fig. 2, a side elevation thereof; Fig. 3, a section on the line l lllll of Fig. l; and l ig. l, a. section on the line l \"*:l V of l ig. l.

()u the drawings. 1 designates a castuuetal su]f)port or l'rame for the assen'ibled annular laminations provided at their inner edges with transverse slots 9 for the stator windings, not shown. The annular assembly of laminations is surrounded peripherally by the support or frame having peripheral ventilating slots extending entirely through the support. These slots communicate with lateral ventilating slots 4 extending from the slots 3 to both outer faces of the support. The slots 3 are separated by the crossbar-s 5. the lower bar 5 as well as the adjacent parts of the frame having the transverse slot 6 which extends entirely through the frame. 7 designates feet for the support. The ends Serial No. 502,254v

of the support overlap the outer portions of the end faces of the assembled laminations. These overlapping portions are annular ribs or flanges 8 which lie against the outer members of the assembly. The said crossbars 5 engage the periphery of the assembly.

In manufacturing my invention, I support the assembly ot laminations by any suitable means and clamp them together by any suitable means, so that all slackness between the laminations is taken up. Then a mold tor the frame is formed around the assembled lznuinations, and molten metal is poured into the mold to form the said frame. As the metal frame cools it shrinks transversely and cireumterentially so that the ribs or flanges 8 force the laminatious together into a firm unit, and the unit is tightly clamped to the frame between the opposing flanges and by the cross-bars 5. In order to relieve the radial strains on the frame, I may provide the safety slot 6. In case the strains due to the contraction of the metal transversely ot' the laminations should become so great as to break the frame, I release the said clamping means sufficiently to reduce the strains to a safe value. The amount of release will depend upon the thickness of the assembly of laminations, the degree of tightness to which. they are clamped, and the strength ol the metal of which the frame is to be made. The subject matter diswlosed in the last two preceding: sentences is claimed in my application Serial No. 5 77703, tiled July 2(3, [922.

The support or traiue 1 may be composed of magnetic or uon--maguetie metal, as iron. steel, bronze,aluminum, and the like.

I claim:

l. A stator comprising an assembly of annular laminations and a metal frame cast around the same, there being a gap in the frame to prevent 't'racture oi? the frame during its cooling.

2. In the ll'llllllfiICtlll'C o't stators, supporting a group of annular lamimitions and casting about them an interrupted annulus.

Signed at Cleveland, Ohio, this 14th day of Sept. 1921.

HARRY F. STE-NIPPON. 

